Merc Gearcase interchange?

[Chris1956]

I threw a rod on my '77 Merc 1500 (inline six, longshaft), with a 4-1/4" gearcase. I replaced it with a '93 Merc 135V6 (longshaft) with A 4-3/4" gearcase. The inline's gearcase is still good, will it fit the new motor? I have props for both size gearcases, and the gear ratio is the same, so that is not an issue.

 

[Faztbullet]

Re: Merc Gearcase interchange?

With a few mod's it will fit.

 

[Chris1956]

Re: Merc Gearcase interchange?

OK, What kinds of modifications are necessary?

 

[Chris1956]

Re: Merc Gearcase interchange?

Bump....

 

[Faztbullet]

Re: Merc Gearcase interchange?

To make it work you will have to remove the front stud on gearcase and you have to slightly enlongate rear holes above prop.

 

[Chris1956]

Re: Merc Gearcase interchange?

Thanks for the info. Since the '93 V6 has the hole for the front stud of the gearcase, I am assuming that the hole is in the wrong place. Is that the issue?

 

[Faztbullet]

Re: Merc Gearcase interchange?

Yep and 2 rear studs. also forgot you have to remove any line up pins in gearcase or midsection.